Partially Transesterified Epoxidized Bioesters for PVC
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Solution Overview
Problem
Current PVC plasticizers, primarily phthalates, are dependent on petroleum and raise health concerns, with alternatives like epoxidized soybean oil and linseed oil facing compatibility and cost issues, limiting their use as viable replacements.
Innovation Solution
Development of partially transesterified, acetylated, and epoxidized bioesters from vegetable oils and sugar cane ethanol, which are fully compatible with PVC resin, offering a range of ester varieties and improved properties through partial transesterification, acetylation, and epoxidation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If epoxidized soybean oil is used as a primary plasticizer, then it provides a renewable alternative to petroleum-based plasticizers, but its low compatibility with PVC limits its use to small quantities
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of epoxidized soybean oil through partial transesterification with lower alcohols (C1-C4). This chemical modification changes the molecular parameters (reducing molecular weight, altering chain flexibility) to improve compatibility with PVC, allowing the plasticizer to be used in higher quantities while maintaining resin compatibility.
Solution Approach 2:
The patent segments the triglyceride structure of soybean oil by performing partial transesterification, which breaks down some of the ester bonds while leaving others intact. This creates a mixture of modified and unmodified triglycerides with varying compatibility, allowing the overall composition to achieve better PVC compatibility than fully intact epoxidized soybean oil.
2Adaptability or versatility
If epoxidized linseed oil is used as a primary plasticizer, then it has greater compatibility with PVC due to higher oxirane index, but its higher price severely restricts its use
Solution Approach 1:
The patent replaces the expensive epoxidized linseed oil with the cheaper epoxidized soybean oil as the base material. By applying partial transesterification modification, the patent creates a cost-effective alternative that achieves sufficient PVC compatibility without requiring the higher oxirane index of linseed oil, thus eliminating the cost disadvantage.
Solution Approach 2:
The patent changes the chemical parameters of epoxidized soybean oil through controlled partial transesterification to achieve the desired balance between compatibility and cost. By adjusting the degree of transesterification and selecting appropriate lower alcohols, the patent optimizes the plasticizer properties to match or exceed epoxidized linseed oil performance at a lower cost.
3Adaptability or versatility
If transesterification or interesterification of vegetable oils is performed to create plasticizers with high oxirane index, then compatibility with PVC improves, but the resulting esters have larger molecular weight and much higher cost compared to phthalates
Solution Approach 1:
The patent applies partial action by performing only partial transesterification rather than complete transesterification. This partial modification achieves sufficient improvement in PVC compatibility while avoiding the excessive molecular weight increase and cost escalation that would result from complete transesterification or interesterification processes.
Solution Approach 2:
The patent carefully controls the transesterification reaction parameters (catalyst amount, reaction time, alcohol-to-oil ratio) to achieve optimal modification without excessive molecular weight increase. By adjusting these parameters, the patent produces plasticizers with improved compatibility while maintaining molecular weights and costs comparable to conventional phthalates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting bioesters provide enhanced compatibility, flexibility, UV resistance, thermal stability, and cost-effectiveness, overcoming the limitations of existing alternatives while ensuring safety and efficiency in PVC applications.
Implementation Method 1
obtained by partial transesterification of vegetable oils with ethanol or glycerin and further acetylation and epoxidation
Implementation Method 2
obtained by partial transesterification of vegetable oils with ethanol or glycerin and further acetylation and epoxidation
Implementation Method 3
obtained by partial transesterification of vegetable oils with ethanol or glycerin and further acetylation and epoxidation
Implementation Method 4
when added to the PVC resin allow for movement between the PVC molecules promoting flexibility to the final compound
Data Source
AI summary
The invention developed compositions of plasticizers obtained from the partial transesterification, acetylation and epoxidation of vegetable oils with ethanol or glycerin, henceforth called partially transesterified epoxidized bioesters.